I m p r o v i n g t h e X H T M L e x p o r t - - PowerPoint PPT Presentation

I m p r

• v

i n g t h e X H T M L e x p

• r

t f i l t e r

A n d m e n t

• r

i n g s t u d e n t s t h r

• u

g h p a t c h e s a n d l i c e n s e s

Andrea Pescetti pescetti@apache.org

Paolo Morelli:

An Obscure Little Feature An Obscure Little Feature An Obscure Little Feature An Obscure Little Feature

A n I n t e r e s t i n g S t

• r

y

• A little feature
• Students
• Forks
• Licenses

T h e X H T M L E x p

• r

t

• One of many export

filters

• File Export XHTML

→ →

• Not the HTML export!

E x p

• r

t i n g t

• X

H T M L

• Available in all modules, but

focusing on Impress here.

• Produces one .html file, not

a slide-by-slide gallery.

• Code: main/filter/source/xslt

H a b i b ' s W

• r

k

• Improvements by Habib Louafi,

a PhD student in Canada.

• Extends the XHTML filter with

features that make it mature.

• Published in May 2013

(Louafi-Coulombe).

H a b i b ' s C

• d

e

• Full diff: 6666 lines.
• Based on versions 2.4 (2008)

and 3.1 (2009).

• Contributed under Apache

License v2 in June 2013: #i122494#

Paolo Morelli:

New Features New Features New Features New Features

I m p r

• v

i n g F

• n

t s

• Fonts used to be replaced by

the browser's default font.

• style_collector.xsl collects

styles, style_mapping_css.xsl converts them to CSS.

• Now fixed: font is preserved.

I m p r

• v

i n g L a y

• u

t

• Text boxes in a slide used to

be exported sequentially in XHTML.

• All layout lost (body.xsl)
• Now properly placed with

coordinates and CSS.

I m p r

• v

i n g I m a g e s

• Images used to be converted to

base64 and rendered as data streams embedded in XHTML.

• Problems with some browsers.
• Now solved: the “Link” option

is used to preserve image.

I m p r

• v

i n g S h a p e s

• Shapes used to be ignored.
• Now converted using the

JavaScript Vector Graphics Library by Walter Zorn.

• Support for rectangles,

circles, ellipses, lines.

I m p r

• v

i n g S c a l i n g

• The export did not support

scaling.

• Scaling parameter added to

resize the output (for mobile).

• Done by calling ImageMagick

from a Java-based application.

B e f

• r

e a n d A f t e r ( b y H a b i b )

• Fonts
• Layout
• Images
• Shapes
• Scaling

O r i g i n a l F i l e

B e f

• r

e

A f t e r

Paolo Morelli:

Integration and difficulties Integration and difficulties Integration and difficulties Integration and difficulties

F

• u

r Y e a r s A r e L

• n

g

• Habib's code cannot be used

immediately.

• Code in both OpenOffice and

LibreOffice has evolved, entire directories were reorganized.

• Need to refactor the patch.

W h e r e ' s t h e X H T M L E x p

• r

t ?

• On Windows, XHTML export is

not installed by default.

• Decision taken (undocumented)

before 3.3.0: #i119663#

• Need to enable it with a

custom installation.

D e p e n d e n c y I s s u e s

• Habib's approach includes in

full the late (to the best of

• ur knowledge) Walter Zorn's

JavaScript library.

• LGPL 2.1+, Apache Category B.
• Good case for Apache Legal.

C u r r e n t S t a t u s

• Vadim Yedzinovich, a new

contributor, is being mentored to work on this.

• Patch aligned and being

sliced in several components.

• First fixes to appear in 4.1.

F u t u r e D e v e l

• p

m e n t s

• Repurpose the XHTML export to

an HTML5 export.

• Scaling: CSS3's transform.
• Shapes: HTML5's <canvas> and

no JavaScript.

• Volunteers welcome!

T h a n k s f

• r

a t t e n t i

• n

Andrea Pescetti

pescetti@apache.org www.openoffice.org

Image credits: Flickr, PLIO Archives.